Natural Resources Wales has issued a warning to prepared for the possibility of localised flooding over the next few days up until Christmas.
It says 'persistent and intense rainfall' is expected to reach Wales early tomorrow morning, continuing until Tuesday.
Most parts of Wales will experience heavy rainfall at some point, but South, West and Mid Wales will be worst affected.
After heavy rainfall earlier this week, the ground is still saturated, making flooding more likely.
It has advised people travelling over Christmas to allow extra time as conditions may be difficult.